Using the plugin, you can acquire new certificates for your site, and then switch your site into HTTPS..
Upload the entire ose-lets-encrypt folder to the wp-content plugins directory or download it through WordPress backend...
Activate the plugin through 'Plugins WordPress...
After the activation you will find in WordPress backend where you can do settings and request the certificate for your WordPress site.
You will then receive the certificate package via the email.
Finally, you just need to install the in the server control panel, e.g.
You need to create FTP with the access to the directory site root.well-known and enter the FTP to the setting.
The plugin acts as connection between your WordPress site and Let's Encrypt it's used to obtain the certificate.
You need to install SSL certificates in your hosting control panel then change URL to HTTPS WordPress Settings to switch your site to HTTPS...
Browse the code, check out SVN repository, or subscribe to the development log by RSS...
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